Save the Zebes CrittersWhen you are escaping during the countdown at the very end of the game, don't go straight to your ship from Crateria's caves. Instead, go to the room where you first acquired the morph ball bombs. Inside should be the critters that helped you escape certain rooms earlier in the game. Once they leave the room, you can exit too from where you entered. Saving them will affect the ending.

Easiest endingBeat the game making sure your file has more than 10 hours on it.

Higher JumpIn Super Metroid, when you get the Gravity Suit, you can move underwater freely. However, there is a trick that you can use to jump higher underwater. First, find a location that is fully submerged in water. Try a room in Maridia or the room before Lower Norfair (the ones with filled with Lava) Next, hold the jump button. Immediatly after you press it, press pause. Go to the inventory menu and switch off the gravity suit. Hold the jump button and unpause the game. You will jump higher than normal. Use this trick to get the screw attack before the space jump.

Kill Draygon in one hitAs soon as the boss fight with Draygon begins, note the four turrets firing electricity from the walls - two on either side. Before Draygon even shows up, blast away all four turrets with charge shots. See how the turrets spew out electricity after being killed? Equip the Grapple Beam and get ready to use this to your advantage. Instead of fighting Draygon the normal way, allow him to grab you. While he's swinging you about the room, use the Grapple Beam to latch on to one of the panels on the wall that was once occupied by a turret. The electricity will go through the Grapple Beam, through your suit, and to Draygon himself. Samus will stay locked on until Draygon dies.